I've been running the three Penumbra games without problems since the $5 special offer so I didn't hesitate to buy Amnesia the moment I heard about it. However, it won't install on my computer. I'm running Fedora 14, KDE, proprietary NVidia drivers, RPMFusion enabled but nothing unusual installed, on a 32-bit machine: dual-core 3GHz Pentium 4 with 4GB RAM (3.3G available) and about 450GB disk.

Just to follow up my own post for anyone else searching this, the problem was not enough free space in /tmp (had only 1.7GB, installer needed 1.9GB). Telling it to use /var/tmp instead allowed it to install.